Coding Decoding

In any communication(verbal or nonverbal), there are always two parties i.e. Sender (The one who wants to send the data) and Receiver(one who receives the data). We always want to send our data securely. For this purpose, we use the mechanism of coding and decoding so that the third party (other than the sender and receiver) can never understand the communication of both the parties.

Coding means transforming the original data into an encrypted form which follows a certain pattern.Coding is also known as encryption.
Decoding means converting the coded data into an original form. It is also known as Decryption.
The coding and decoding test is setup to determine the ability of a candidate that he is capable to decipher any code or message.

Type 1-Letter Coding

Q1. TAP is SZO, then FREEZE is, (SSC CGL Tier-I 2015)

EQDFYG 2) EQDDYD 3) ESDFYF 4) GQFDYF
Answer- (2) EQDDYD

Q2. If the word PRINCIPAL is written as LAPICNIRP, how ADOLESCENCE can be written in that code? (SSC CHSL DEO&LDC 2014)

TYPE 3 -(SUBSTITUTION)

If air is called ‘green’,’green’ is called ‘blue’,’blue is called ‘sky’,’sky’ is called ‘yellow’,’yellow’ is called ‘water’ and ‘water’ is called ‘pink’ then what is the colour of clear ‘sky’? (SSC CGL Tier-I Exam 2015)

Sky 2) Water 3) Blue 4) YellowAnswer– (1) sky

TYPE-4(SYMBOL CODING)

Q1.In a certain code language FIRE is written as #%@$ and DEAL is written as !$*^.How is FAIL Written in that code Language?